I've got a few of these 2# 6V battery Harley, and thinking of doing 3 6V (2 in saddle bags, or big 12/12 under seat & parallel 6V in saddle bags???). But need to scratch my head more about attaching to the stock wiring. Have looked around but find no ones seems to have done this? I'll have to pull out the harness of one of them to examine it, just figured I'd see if anyone has any ideas? I'm thinking 12V low speed and 18 volt high speed. And it's the "A" plugs that feed back to the speed/direction selector switches, not the 2 plugs jumped to make 12V right at the batteries. Thanks